WO1994016296A1 - Dispositif de detection de microvibrations de tres faible amplitude - Google Patents
Dispositif de detection de microvibrations de tres faible amplitude Download PDFInfo
- Publication number
- WO1994016296A1 WO1994016296A1 PCT/EP1994/000050 EP9400050W WO9416296A1 WO 1994016296 A1 WO1994016296 A1 WO 1994016296A1 EP 9400050 W EP9400050 W EP 9400050W WO 9416296 A1 WO9416296 A1 WO 9416296A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical cavity
- plate
- networks
- microvibration
- low amplitude
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
Definitions
- the invention relates to a device for detecting micro-vibrations of very low amplitude, which is likely, thanks to its extraordinary sensitivity, to pick up vibrations with an amplitude of 10 -20m and less.
- the purpose of the present invention is to provide a micro-vibration detection device, which is significantly less bulky than the LIGO project and less costly, and which is also capable of picking up micro-movements with an amplitude of 10 —20 and even less.
- the device comprises
- an optical cavity composed of a glass plate sandwiched between two three-dimensional interferometric networks, said plate being in contact with a body whose micro-vibra- tions are to be detected, and the two interferometric networks resting by gravity on supports integral with said body, - a coherent light source illuminating a first of the two networks of said optical cavity, - and a display screen receiving the light reflected from this cavity optical.
- Figure 1 shows a top view of an optical table, on which is mounted the device according to the invention.
- Figure 2 shows the same device seen from the side.
- Figure 3 shows the optical cavity of the same device seen from the front.
- Figure 4 shows in exploded representation the optical cavity forming part of the device according to the invention.
- Figures 1 to 3 show three orthogonal views of the device according to the invention. It has been designed to capture gravitational waves and for these purposes it has been mounted on an optical table 1, the feet 2 and 3 of which are fitted with damping means (not visible) for ground vibrations to isolate the table. vibrations from the earth. Such means are well known for optical tables and do not need to be described here in detail.
- Table 1 is made of steel and weighs, for example, without legs 360 kg.
- two bases 4 and 5 have been placed, which are maintained on the table by magnetic forces and which are conventional in the field of optical tests.
- Each of these bases has a support bar 6 and 7, which extends parallel to the surface of the table and which supports an optical cavity 8.
- This optical cavity is shown in more detail in FIG. 4 and comprises two glass substrates 9 and 10, which enclose between them a glass plate 11.
- the dimensions of the substrates are for example 30 to 40 cm, while the glass plate 11 is a square plate 10 cm long and 1 mm thick.
- Each substrate carries on one side (exterior or interior) a photographic emulsion, on which an interferometric network has previously been recorded.
- Such networks are known and are produced by illuminating the emulsion by two spherical waves coming from a coherent light source.
- the glass plate 11 the major part of which is sandwiched between the substrates 9 and 10, extends by an end beyond the reach of these two plates and rests by this end on the table 1.
- This end can either be the edge of one side of the plate as shown in Figure 4, or the corner between two edges of the plate as shown in Figure 3.
- the two substrates and the glass plate have large flat surfaces and once assembled are held together by the impossibility for air to penetrate between the plate and the substrates.
- the optical cavity rests on the support bars 6 and 7 by simple gravity and is main ⁇ held in a vertical position on the table (which is horizontal) by a bottom 12 consisting of a metal plate and fixed by the magnetic forces mentioned above- above on bases 4 and 5.
- This optical cavity 8 can be considered as a sensor for the micro-movements of the table 1, because the glass plate defines between it and the two substrates 9 and 10 thin layers of air which are modified by the vibrations of table 1.
- a display screen 14 which set in motion correlated to said vibrations. If necessary, this display screen can be replaced by a photodetector system followed by automatic image processing to develop the correlation of the movements in the image.
- damping means of the table are deactivated, it is possible to transmit the movements of the earth on the table and thus capture seismic movements provided that the tests are carried out in a region where the background noise is not predominant.
- a theoretical estimate of the micro-movements that the device according to the invention is capable of recording leads to minimum detected amplitudes which are 10 -20m (the radius of the electron being of the order of 10 -15m!). This amplitude could be even smaller by perfecting the legs of the table, because the table, although having a few degrees of freedom to move, cannot be considered to be completely free. In addition, an increase in the dimensions of the optical cavity 8 and those of the table could further lower the sensitivity limit of the device.
- the background noise problem requires intelligent processing of the images captured on the screen in order to extract useful signals from the noise.
- This image processing is carried out in computers and is based on a correlation of the different images. This correlation can be improved by comparing in a training phase the movements of the fringes with the movements of the source which caused these micro-movements.
- the device according to the present invention could be used as a passive radar.
- the device's high sensitivity to gravitational interactions could indeed be used to detect moving masses such as, for example, planes.
- Such a radar is purely passive, since it does not use a interrogation signal.
- the invention is not limited to the device shown in the drawings, a device which is a set of laboratories, and any modification aiming at an industrial application of the device is included within the scope of the invention as claimed.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69404823T DE69404823T2 (de) | 1993-01-15 | 1994-01-10 | Mikrovibrationsfühlgerät für sehr niedriger amplitude |
EP94904648A EP0676039B1 (fr) | 1993-01-15 | 1994-01-10 | Dispositif de detection de microvibrations de tres faible amplitude |
JP6515683A JPH08505470A (ja) | 1993-01-15 | 1994-01-10 | 非常に小さい振幅の微振動を検出する装置 |
US08/495,605 US5646728A (en) | 1993-01-15 | 1994-01-10 | Ultrasensitive interferometer suitable for detecting gravitational waves |
GR970402616T GR3024974T3 (en) | 1993-01-15 | 1997-10-09 | Very low amplitude microvibration sensing device. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU88211A LU88211A1 (fr) | 1993-01-15 | 1993-01-15 | Dispositif de détection de microvibrations de trés faible amplitude |
LU88211 | 1993-01-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994016296A1 true WO1994016296A1 (fr) | 1994-07-21 |
Family
ID=19731386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/000050 WO1994016296A1 (fr) | 1993-01-15 | 1994-01-10 | Dispositif de detection de microvibrations de tres faible amplitude |
Country Status (11)
Country | Link |
---|---|
US (1) | US5646728A (fr) |
EP (1) | EP0676039B1 (fr) |
JP (1) | JPH08505470A (fr) |
AT (1) | ATE156588T1 (fr) |
CA (1) | CA2152601A1 (fr) |
DE (1) | DE69404823T2 (fr) |
DK (1) | DK0676039T3 (fr) |
ES (1) | ES2106503T3 (fr) |
GR (1) | GR3024974T3 (fr) |
LU (1) | LU88211A1 (fr) |
WO (1) | WO1994016296A1 (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6417597B1 (en) | 1999-11-19 | 2002-07-09 | Robert M. L. Baker, Jr. | Gravitational wave generator |
US6160336A (en) * | 1999-11-19 | 2000-12-12 | Baker, Jr.; Robert M. L. | Peak power energy storage device and gravitational wave generator |
US20070001541A1 (en) * | 1999-11-19 | 2007-01-04 | Baker Robert M L Jr | Gravitational wave propulsion |
US20040130237A1 (en) * | 1999-11-19 | 2004-07-08 | Baker Robert M. L. | Gravitational wave propulsion and telescope |
US6784591B2 (en) | 1999-11-19 | 2004-08-31 | Robert M. L. Baker, Jr. | Gravitational wave generator utilizing submicroscopic energizable elements |
US20040056545A1 (en) * | 1999-11-19 | 2004-03-25 | Baker Robert Ml | Gravitational wave imaging |
US7414730B2 (en) * | 2005-05-06 | 2008-08-19 | The Board Of Trustees Of The Leland Stanford Junior University | High precision interferometer apparatus employing a grating beamsplitter |
EP2233951A1 (fr) | 2009-03-27 | 2010-09-29 | Elmarx Srl | Générateur d'ondes gravitationnelles utilisant des oscillateurs couplés et procédés pour l'amplification d'ondes gravitationnelles |
DE102010052353A1 (de) | 2010-11-25 | 2012-05-31 | Boris Klepatsch | Vorrichtung zur Erzeugung von Gravitationswellen |
DE202010015800U1 (de) | 2010-11-25 | 2011-05-05 | Klepatsch, Boris | Vorrichtung zur Erzeugung von Gravitationswellen |
CN104252008A (zh) * | 2013-06-29 | 2014-12-31 | 江南大学 | 基于triz的光学干涉装置技术进化设计及其方法 |
WO2024006583A2 (fr) * | 2022-07-01 | 2024-01-04 | Applied Physics, Inc. | Détection d'ondes gravitationnelles basée sur un apprentissage profond |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4188096A (en) * | 1976-04-02 | 1980-02-12 | The United States Of America As Represented By The Secretary Of The Navy | Acousto-optical transducer |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3744909A (en) * | 1970-03-26 | 1973-07-10 | M Bruce | Gravity interferometer system |
-
1993
- 1993-01-15 LU LU88211A patent/LU88211A1/fr unknown
-
1994
- 1994-01-10 EP EP94904648A patent/EP0676039B1/fr not_active Expired - Lifetime
- 1994-01-10 DE DE69404823T patent/DE69404823T2/de not_active Expired - Fee Related
- 1994-01-10 US US08/495,605 patent/US5646728A/en not_active Expired - Fee Related
- 1994-01-10 ES ES94904648T patent/ES2106503T3/es not_active Expired - Lifetime
- 1994-01-10 AT AT94904648T patent/ATE156588T1/de not_active IP Right Cessation
- 1994-01-10 CA CA002152601A patent/CA2152601A1/fr not_active Abandoned
- 1994-01-10 JP JP6515683A patent/JPH08505470A/ja active Pending
- 1994-01-10 DK DK94904648.6T patent/DK0676039T3/da active
- 1994-01-10 WO PCT/EP1994/000050 patent/WO1994016296A1/fr active IP Right Grant
-
1997
- 1997-10-09 GR GR970402616T patent/GR3024974T3/el unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4188096A (en) * | 1976-04-02 | 1980-02-12 | The United States Of America As Represented By The Secretary Of The Navy | Acousto-optical transducer |
Non-Patent Citations (1)
Title |
---|
BILLING ET AL: "an argon laser interferometer for the detection of gravitational radiation", JOURNAL OF PHYSICS E. SCIENTIFIC INSTRUMENTS, vol. 12, no. 11, November 1979 (1979-11-01), BRISTOL, GB, pages 1043 - 1050 * |
Also Published As
Publication number | Publication date |
---|---|
CA2152601A1 (fr) | 1994-07-21 |
US5646728A (en) | 1997-07-08 |
DE69404823T2 (de) | 1997-11-27 |
DK0676039T3 (da) | 1998-03-09 |
GR3024974T3 (en) | 1998-01-30 |
ATE156588T1 (de) | 1997-08-15 |
DE69404823D1 (de) | 1997-09-11 |
ES2106503T3 (es) | 1997-11-01 |
JPH08505470A (ja) | 1996-06-11 |
LU88211A1 (fr) | 1994-09-09 |
EP0676039A1 (fr) | 1995-10-11 |
EP0676039B1 (fr) | 1997-08-06 |
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